[PATCH v29 24/32] x86/process: Change copy_thread() argument 'arg' to 'stack_size'

Yu-cheng Yu
2021-08-20T18:21:32Z

The single call site of copy_thread() passes stack size in 'arg'. To make
this clear and in preparation of using this argument for shadow stack
allocation, change 'arg' to 'stack_size'. No functional changes.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
arch/x86/kernel/process.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 1d9463e3096b..e6e4d8bc9023 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -116,8 +116,9 @@ static int set_new_tls(struct task_struct *p, unsigned long tls)
return do_set_thread_area_64(p, ARCH_SET_FS, tls);
}

-int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
- struct task_struct *p, unsigned long tls)
+int copy_thread(unsigned long clone_flags, unsigned long sp,
+ unsigned long stack_size, struct task_struct *p,
+ unsigned long tls)
{
struct inactive_task_frame *frame;
struct fork_frame *fork_frame;
@@ -158,7 +159,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
if (unlikely(p->flags & PF_KTHREAD)) {
p->thread.pkru = pkru_get_init_value();
memset(childregs, 0, sizeof(struct pt_regs));
- kthread_frame_init(frame, sp, arg);
+ kthread_frame_init(frame, sp, stack_size);
return 0;
}

@@ -191,7 +192,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
*/
childregs->sp = 0;
childregs->ip = 0;
- kthread_frame_init(frame, sp, arg);
+ kthread_frame_init(frame, sp, stack_size);
return 0;
}

--
2.21.0